Machine Kinematics

Mechanism

Question 1
Marks : +2 | -2
Pass Ratio : 100%
A point on a connecting link of a double slider crank mechanism traces a
straight line path
hyperbolic path
parabolic path
elliptical path
Explanation:
None.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
A kinematic chain is known as a mechanism when
none of the links is fixed
one of the links is fixed
two of the links are fixed
none of the mentioned
Explanation:
When one of the links of a kinematic chain is fixed, the chain is known as mechanism.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is correct as regard to the difference between a machine and a structure?
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another.
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only.
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work.
all of the mentioned
Explanation:
None
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The inversion of a mechanism is
changing of a higher pair to a lower pair
turning its upside down
obtained by fixing different links in a kinematic chain
obtained by reversing the input and output motion
Explanation:
We can obtain as many mechanisms as the number of links in kinematic chain by fixing, in turn,different links in a kinematic chain. This method is known as inversion of the mechanism.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to
l – 2
l – 1
l
l + 1
Explanation:
Whatever is the number of links in a mechanism, only that much number of inversion can be obtained.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
In a single slider crank chain
each of the four pairs is a turning pair
one is a turning pair and three are sliding pairs
two are turning pairs and two are sliding pairs
three are turning pairs and one is a sliding pair
Explanation:
Single slider crank chain consists of one sliding pair and three turning pairs.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In a four bar chain or quadric cycle chain
each of the four pairs is a turning pair
one is a turning pair and three are sliding pairs
two are turning pairs and two are sliding pairs
three are turning pairs and one is a sliding pair
Explanation:
Four bar chain or quadric cycle chain consists of four links, each of them forms a turning pair.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The mechanism consisting of three turning pairs and one sliding pair, is called a
Pendulum pump or Bull engine
Rotary internal combustion engine
Oscillating cylinder engine
Crank and slotted lever quick return motion mechanism
Explanation:
All the mechanisms mentioned above are forms of single slider crank chain only and hence, they all contain three turning pairs and one sliding pair. The inversion of a single slider crank chain are found in the following mechanism:
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The Grubler’s criterion for determining the degrees of freedom (n) of a mechanism having plane motion is
n = (l – 1) – j
n = 2(l – 1) – 2j
n = 3(l – 1) – 2j
n = 4(l – 1) – 3j
Explanation:
None
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In a coupling rod of a locomotive, each of the four pairs is a _____________ pair.
sliding
turning
rolling
screw
Explanation:
In a locomotive, one rod of the coupling rod can only turn or revolve about a fixed axis of another rod. This takes place only in case of turning pair.